A 38-year-old woman with acute alcoholic pancreatitis presents with severe epigastric pain, elevated amylase (1200 U/L), and signs of systemic inflammatory response. She is fluid-resuscitated and hemodynamically stable. Which drug is the first-line choice for analgesia in acute pancreatitis?

Explanation

## Analgesia in Acute Pancreatitis **Key Point:** Morphine is the first-line opioid analgesic for acute pancreatitis. The traditional concern that morphine causes sphincter of Oddi spasm is not supported by clinical evidence and should not prevent its use in severe pain. ### Why Morphine is Preferred **High-Yield:** Morphine provides superior analgesia for the severe visceral pain of acute pancreatitis. The myth that morphine causes sphincter of Oddi spasm and worsens pancreatitis has been debunked by modern evidence and is no longer a contraindication. ### Analgesic Strategy in Acute Pancreatitis 1. **Initial approach:** Adequate fluid resuscitation and NPO status 2. **Pain control:** Opioids (morphine) are indicated for severe pain 3. **Adjuncts:** Paracetamol can be used as a supplement but is inadequate as monotherapy for severe pain 4. **Avoid:** NSAIDs (risk of renal injury in setting of hypovolemia and systemic inflammation) **Clinical Pearl:** The patient's pain severity and systemic inflammatory response indicate the need for potent opioid analgesia. Inadequate analgesia increases stress response and may worsen outcomes. ### Comparison of Opioid Options | Opioid | Sphincter Effect | Efficacy | Use in AP | |---|---|---|---| | Morphine | No significant effect (myth debunked) | Excellent | **First-line** | | Meperidine | Minimal effect | Good | Avoid (metabolite toxicity) | | Tramadol | No direct effect | Moderate | Second-line | | Paracetamol | N/A | Mild–moderate | Adjunctive only | **Warning:** Meperidine should be avoided in acute pancreatitis because its metabolite normeperidine can accumulate and cause neurotoxicity, especially with prolonged use or renal impairment. The older teaching that morphine is contraindicated due to sphincter of Oddi spasm is **no longer evidence-based** [cite:KD Tripathi 8e Ch 10]. ### Dosing Considerations - Morphine: 2–4 mg IV every 4–6 hours, titrated to pain control - Adequate analgesia improves patient cooperation with NPO status and reduces stress-induced complications - Monitor for respiratory depression and hypotension, especially in elderly or hemodynamically unstable patients **Mnemonic:** **MOANS** — Morphine is the Opioid of choice; Avoid NSAIDs; Normalize fluid status; Support with adjuncts (paracetamol, antispasmodics if biliary colic).